
132 Part Two • IPv6 Protocols
Destination address is the 128-bit address of the intended recipient of
the IPv6 packet. This address may be a unicast, multicast, or anycast
address. If a routing extension is being used (which specifies a partic-
ular route that the packet must traverse), the destination address may
be one of those intermediate nodes instead of the ultimate destina-
tion node.
The Differentiated Services field and the concept of IPv6 flows are dis-
cussed in greater depth in Chapter 15. In the absence of support for
intermediate IP fragmentation, determining the Path MTU becomes more
important than ever to ensuring that IPv6 packets are